
# import smtplib
# smtp = smtplib.SMTP()
# print(smtp.__dict__)


# s1 = "boyloy"
# print(s1[1])
# s2 = set(s1)
# s2.add('o')
# print(s2)
#
# s3 = set("")
# s3.add('p')
# print(s3)
#
#
# s4 = {'a', 'b', 'c'}
# s5 = ""
# for x in s4:
# 	s5 += x
# print(s5)
#
# print(list(s1))


# lists = ["" for i in range(3)]
# # lists[0].append('a')
# # lists[1].append('c')
# lists[1]  = lists[1]+'a'
# lists[2]  = lists[2]+'b'
# print(lists)

# s6 = "ghghghg"
# for v in s6:
# 	print(v)

# s7 = "2467"
# for v in s7:
# 	if int(v) > 5:
# 		print(999)
# 	elif int(v) > 3:
# 		print(888)

# print(s7.strip())
# print(2**31)

root = "hbfhyu"
if not root:
	print('is null')
else:
	print('no null')


print(root[::-1])

a = 123
b = "abc"
c = 4.5768
d = [1, 5, 6, 3, 4]
e = [['h', 'f', 'd'], [1, 5, 6]]
f = {'f', 'g', 'y', 66}
g = ('g', 't', 'f')
h = {'name': 'tom', 'age': 20, 3: 9}

print(type(a))
print(type(b))
print(type(c))
print(type(d))
print(type(e))
print(type(f))
print(type(g))
print(h)

h.pop('name')
print(h)
d.pop(2)
print(d)

print(sum(d))
print(d[1:2])

e.append([10, 19, 18])
print(e)


# print(isinstance(root, float))


class daynames:
	def __init__(self, dataval=None):
		self.dataval = dataval
		self.nextval = None

	def getValue(self):
		print(self.dataval)

	def square(self, x):
		print(x ** 2)
		return ''


e1 = daynames('Mon')
e1.getValue()
# print(type(e1))

# print(max([4, 6, 9, 3]))

print(abs(-23))

from numpy import *



